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Note 18 - Quarterly Financial Information (amounts in thousands, except per share data) (Detail) - Quarterly financial information: (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenues |  | $ 630,507 | $ 501,156 | $ 459,893
Gross profit | 5,900 | 47,472 | 39,837 | 62,705
Income (loss) before income taxes and earnings attributable to noncontrolling interests |  | 17,133 | (51,716) |
Net income (loss) attributable to Sterling common stockholders | 4,200 | (297) | (35,900) | 19,087
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |
Basic (in Dollars per share) |  | $ (0.26) | $ (2.24) |
Diluted (in Dollars per share) |  | $ (0.26) | $ (2.24) |
March 31 [Member] |  |  |  |
Revenues |  | 98,425 | 99,242 |
Gross profit |  | 1,873 | 7,599 |
Income (loss) before income taxes and earnings attributable to noncontrolling interests |  | (3,781) | 1,648 |
Net income (loss) attributable to Sterling common stockholders |  | (7,500) | 44 |
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |
Basic (in Dollars per share) |  | $ (0.44) | $ 0.00 |
Diluted (in Dollars per share) |  | $ (0.44) | $ 0.00 |
June 30 [Member] |  |  |  |
Revenues |  | 168,709 | 128,498 |
Gross profit |  | 15,159 | 13,582 |
Income (loss) before income taxes and earnings attributable to noncontrolling interests |  | 8,652 | 7,437 |
Net income (loss) attributable to Sterling common stockholders |  | 3,287 | 4,211 |
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |
Basic (in Dollars per share) |  | $ 0.15 | $ 0.26 |
Diluted (in Dollars per share) |  | $ 0.15 | $ 0.25 |
September 30 [Member] |  |  |  |
Revenues |  | 205,284 | 159,427 |
Gross profit |  | 14,170 | 14,756 |
Income (loss) before income taxes and earnings attributable to noncontrolling interests |  | 4,915 | 7,925 |
Net income (loss) attributable to Sterling common stockholders |  | 990 | 3,461 |
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |
Basic (in Dollars per share) |  | $ 0.01 | $ 0.21 |
Diluted (in Dollars per share) |  | $ 0.01 | $ 0.21 |
December 31 [Member] |  |  |  |
Revenues |  | 158,089 | 113,989 |
Gross profit |  | 16,270 | 3,900 |
Income (loss) before income taxes and earnings attributable to noncontrolling interests |  | 7,347 | (68,726) |
Net income (loss) attributable to Sterling common stockholders |  | $ 2,926 | $ (43,616) |
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |
Basic (in Dollars per share) |  | $ 0.01 | $ (2.72) |
Diluted (in Dollars per share) |  | $ 0.01 | $ (2.72) |

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